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@article{MS2_1956__4_165619, author = {CHRISTIAN GRAM}, title = {A remark on the construction of the centre of a circle by means of the ruler}, journal = {Mathematica Scandinavica}, pages = {157--160}, publisher = {mathdoc}, volume = {4}, year = {1956}, zbl = {0070.16102}, url = {http://geodesic.mathdoc.fr/item/MS2_1956__4_165619/} }
CHRISTIAN GRAM. A remark on the construction of the centre of a circle by means of the ruler. Mathematica Scandinavica, Tome 4 (1956), pp. 157-160. http://geodesic.mathdoc.fr/item/MS2_1956__4_165619/